diff --git a/Source/NSCharacterSet.swift b/Source/NSCharacterSet.swift
deleted file mode 100644
index 5ebdbc5..0000000
--- a/Source/NSCharacterSet.swift
+++ /dev/null
@@ -1,31 +0,0 @@
-//
-//  NSCharacterSet.swift
-//  Socket.IO-Client-Swift
-//
-//  Created by Yannick Loriot on 5/4/16.
-//
-//  Permission is hereby granted, free of charge, to any person obtaining a copy
-//  of this software and associated documentation files (the "Software"), to deal
-//  in the Software without restriction, including without limitation the rights
-//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-//  copies of the Software, and to permit persons to whom the Software is
-//  furnished to do so, subject to the following conditions:
-//
-//  The above copyright notice and this permission notice shall be included in
-//  all copies or substantial portions of the Software.
-//
-//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-//  THE SOFTWARE.
-
-import Foundation
-
-extension CharacterSet {
-  static var allowedURLCharacterSet: CharacterSet {
-    return CharacterSet(charactersIn: "!*'();:@&=+$,/?%#[]\" {}").inverted
-  }
-}
diff --git a/Source/String.swift b/Source/String.swift
deleted file mode 100644
index 398fc5f..0000000
--- a/Source/String.swift
+++ /dev/null
@@ -1,31 +0,0 @@
-//
-//  String.swift
-//  Socket.IO-Client-Swift
-//
-//  Created by Yannick Loriot on 5/4/16.
-//
-//  Permission is hereby granted, free of charge, to any person obtaining a copy
-//  of this software and associated documentation files (the "Software"), to deal
-//  in the Software without restriction, including without limitation the rights
-//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-//  copies of the Software, and to permit persons to whom the Software is
-//  furnished to do so, subject to the following conditions:
-//
-//  The above copyright notice and this permission notice shall be included in
-//  all copies or substantial portions of the Software.
-//
-//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-//  THE SOFTWARE.
-
-import Foundation
-
-extension String {
-  func urlEncode() -> String? {
-    return addingPercentEncoding(withAllowedCharacters: .allowedURLCharacterSet)
-  }
-}